Improvement in stop-valves for steam and other enginery



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IMPROVEMENT IN STOP-VALVES FOR STEAM AND OTHER ENG-INERY.

The Schedule referred to in these Letters Patent and making part of the s'ame.

To all whom it ma/y concern:

Beit known that I, BENJAMIN F. WILSON, of Syracuse, in the county of Onondaga, and State of New York, have invented a new and useful Improvement in Stop-Valves; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable Others skilled in the art to make and use the same, reference beingr had to the accompanying drawings, forming 'part Of this specification.

This invention relates to a new and useful improvement in stop-valves for steam, gas, water, and other fluids and liquids, whereby they are more securely and perfectly seated than those heretofore employed; and

It consist in forming a projection centrally of each of the backs of the two disks composing the valve, so that there shall be but one and a centrati-bearing surface, or point of contact between them, as will be hereinafter more fully described.

In the accompanying plate of drawings- Figure 1 represents a central longitudinal section of the shell and valve through the line x x of iig. 2.

Figure 2 is a cross-section of iig. l through the line Similar letters of reference indicate corresponding parts.

The Valve-shell is made in two parts, A and B. The former is the passage-way, containing the valve-seats and withdrawing-chamber, and the latter forms the nut for the valve-stem C. The two parts, A and B, are screwed together, as seen in the drawing. D D represent the valve in two parts, the faces Of which are inclined, and working back to back in contact withveach other.

The parts D D are loosely attached to and suspended from the button e, on the end of the stem, by a recess formed in their rounded or back sides, as seen in fig. l. The backs of these parts D are rounded out somewhat abruptly at their centre, to the end that there may be no probability of their coming in contact at any other part-and, accordingly the faces or adjacent edges of the lips, or shoulders i, embracing the button on the lower end of the valve-stem, are filed away so much as is possible, and still insure their rm or secure hold on the button.

F F represent the seats against which the valve closes. The seats and the faces of the valve form double-inclined planes.

4When the valve is closed, as represented in iig. 1, the projections on the rounded backs of the parts D D are in contact, and their faces closed against the inclined seats F F.

By aifording the parts D but a single, and that a central and raised bearing-surface, it will be seen that the valve is seated with a perfectly equal or even pressure around its edges; and should, from any cause, as, for example, the insertion of grit, gravel, or other foreign matter, One'of the parts D be practically unseated at a portion of its edge or periphery, it will still remain seated on its opposite side, while the other part D will be perfectly adjusted with -reference to its usualor parallel position to its seat. The action of the parts D is thus, in a measure, made independent each of the other.

As soon as the valve is started upward, .by turning the stem it is relieved Of friction on the seats, and consequently neither the faces of the valve nor the seats are subject to wear.

Gr is the chamber into which' the valve is withdrawn when open.

The collar h bears upon the top of the valve in closing, and the shoulder i takes a rm in raising it from the seats.

I claim as new, and desire to secure by vLetters Patent- The stop-valve, composed of the structed as herein described.

BENJAMIN F. WILSON.

parts D D, con- Witnesses:

M. V. THOMPSON, LEWIS T. ROBINSON.

hold of the valve 

